BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY DECEMBER 17, 2004 DISCUSSION AT 1 P.M. A fast moving line of snow squalls passed over summit right around 7 a.m. this morning dropping a quick heavy dusting amounting to 0.2 in. The squall began just before 7 and ended around 7:20. 0.01" of liquid equivalent was also measured. TODAY'S OBSERVATIONS 7 a.m. partial obscuration, 3,500ft broken with 1.5 miles visibility in a moderate snow shower; temp 32 deg; dewpoint 31; wind wsw at 23 gusting to 33 mph; six hourly min. temp. 32 deg. BHO SA 1155 -X E35 BKN 11/2SW 165/32/31/2520G29/002/ HIR CLDS VSBL ENE-SE VSBY E-SE 20 SNW SQLL SB53 PK WND 2332/32/ TOTAL NEW SNW 0.1IN/ 8/5// 53010 6000/ 70000 10036 20032 10 a.m. clear with cumulus and moderate cumulus west thru north and 35 miles visibility; temp 37 deg; dewpoint 26; wind southwest at 20 gusting to 28 mph; six hourly precip 0.01 in. BHO SA 1455 CLR 35 165/37/26/2317G24/002/ CU/MDT W-N FEW AC NE-SE HAZY/ 8/230 50000 6001/ 1 p.m. 3,500 ft scattered clouds with 80 miles visibility; temp. 38 dewpoint; 14; wind west at 30 gusting to 39 mph; six hourly max. temp. 39 BHO SA 1755 35 SCT 80 162/38/14/2626G34/001/ FEW CI DSNT SW-WSW PK WND 2638/17/ 8/501 55003 6001/ 10040 20031 WEATHER SUMMARY FOR THURSDAY DECEMBER 16: TEMPERATURE (DEGREES F) MAX.....41 NORMAL.....38 MIN.....16 NORMAL.....24 MEAN....29 NORMAL.....31 DEPARTURE FROM 30-YEAR NORMAL.....- 2 TOTAL DEPARTURE FOR THE MONTH.....+ 42 (2.5 degrees/day) PEAK WIND GUST FOR YESTERDAY........32 S AT 10:26 P.M. AEROVANE.........35 S AT 10:26 P.M. ASOS.............31 SSW AT 10:56 P.M. DAVIS............34 S AT 10:07 P.M. FASTEST MILE FOR YESTERDAY..........26 S AT 10:06 P.M. HIGHEST ASOS 2 MIN AV..............26 S AT 11:20 P.M. HIGHEST ONE MIN. WIND FOR DAVIS ....30 S AT 10:07 P.M. AVERAGE WIND SPEED AND DIRECTION.. 15.4 S AVERAGE WIND SPEED FOR ASOS..........16.0 SSW 200 deg. AVERAGE WIND FOR THE DAVIS SYSTEM....15.9 SSW 200 deg. PRECIPITATION (INCHES) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....TRACE DEPARTURE....-0.14 ASOS..............0.00 TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.1 TOTAL SNOWFALL THIS MONTH TO DATE...........0.3 DEPARTURE....-4.4 TOTAL PRECIPITATION FOR THE MONTH..........3.20 DEPARTURE....+0.85 ASOS..............3.27 TOTAL PRECIPITATION FOR THE YEAR..........52.18 DEPARTURE....+3.17 ASOS.............50.59 PRELIMINARY CLIMATE SUMMARY FOR DECEMBER 2004......CALENDAR DAY DATA DATA REPORTED: 24 HOUR PERIODS ENDING MIDNIGHT EST DATE MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST ... SUNSHINE DATA NOT YET AVAILABLE 12/1 55/39/47/+11/0.80/0/073/13 62 MPH SE Aero 65 MPH SSE 12/2 46/36/41/+5/0/0/379/68 50 MPH W Aero 51 MPH W 12/3 45/32/39/+4/0/0/378/68 33 MPH W 12/4 39/25/32/-3/0/0/500/90 31 MPH SSW 12/5 50/26/38/+3/0/0/532/96 46 MPH W Aero 51 MPH W 12/6 33/20/27/-7/0.03/0.2/000/00 22 MPH NE 12/7 45/32/39/+5/1.48/0/000/00 37 MPH ENE 12/8 52/34/43/+10/0.04/0/402/73 55 MPH W Aero 58 MPH W 12/9 41/32/37/+4/0/0/143/26 25 MPH W 12/10 44/37/41/+8/0.77/0/000/00 40 MPH NE 12/11 44/38/41/+9/0.07/0/000/00 35 MPH NNE 12/12 43/33/38/+6/0/0/099/18 32 MPH W 12/13 44/33/39/+7/0.01/0/050/09 30 MPH WSW 12/14 33/17/25/-6/0/0/371/68 33 MPH WNW Aero 36 MPH WNW 12/15 26/13/20/-11/0/0/534/98 29 MPH NW 12/16 41/16/29/-2/0/0/.../.. 32 MPH S Aero 35 MPH S 12/17 Morning low 31 degrees.. OUR DAILY EXTREMES.... Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR DECEMBER 17 HIGH 63 IN 2000 LOW -10 IN 1942 PRECIP 3.03 INS. IN 1888 SNOWFALL 7.5 INS. IN 1988 PEAK GUST 78 MPH SSE IN 2000 RECORDS FOR DECEMBER 18 HIGH 59 IN 1928 LOW -11 IN 1919 PRECIP 1.44 INS. IN 1915 SNOWFALL 7.0 INS. IN 1904 PEAK GUST 76e W IN 1978 Today's report by: Matt Douglas